1. Department of Gastrointestinal Gland Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China (mainland)
2. Department of Cardiothoracic Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China (mainland)
3. Department of Hepatobiliary Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China (mainland)
4. Department of Colorectal Surgery, The First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China (mainland)